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stiks02 [169]
3 years ago
12

How is the formula for hydrogen different from the formula for helium gas​

Chemistry
1 answer:
creativ13 [48]3 years ago
4 0
Helium is monotonic
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Strontium-90, a radioactive isotope with applications in medicine, has a half-life of approximately 30 years. Out of a 100-gram
AveGali [126]

There are 2 grams remain

<h3>Further explanation</h3>

Given

t1/2 = 30 years

t = 170 years

No = 100 g

Required

Remaining sample

Solution

General formulas used in decay:  

\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}

Input the value :

\tt Nt=100.\dfrac{1}{2}^{170/30}\\\\Nt=1.969\approx 2~grams

5 0
3 years ago
Industrial ethanol (CH3CH2OH) is produced by a catalytic reaction of ethylene (CH2═CH2) with water at high pressures and tempera
Natasha2012 [34]

Answer:

using bond energies = - 37 kJ

using enthalpies of formation = - 45.7 kJ

Explanation:

From the reaction;

CH2═CH2(g) + H2O(g) -------> CH3CH2OH(g)

From the above reaction; there are 4 (C-H) bonds , 1 ( C=C) and 2 (H-O) of ethene which forms 5(C-H) bonds, 1 (C-C) and 1 (C-O) and 1(H-O) bonds.

Using Bond Energies; the heat of the reaction can be written as:

\delta H^0_ {rxn}= ∑ energy of old bond breaking + ∑ energies of the new bond formation.

\delta H^0_ {rxn}= ∑ [(4 * BE_{C-H})  + BE_{C-C}) +  + BE_{O-H})]+ ∑ [(5 * BE_{C-H}) + BE_{C-C}) + BE_{O-H}+ BE_{C-O})]

\delta H^0_ {rxn}= ∑[4*413 kJ)+(614kJ)+(2*647kJ]+ ∑ (5*-413kJ)+(-347kJ)+(-467kJ)+(-358kJ)]

\delta H^0_ {rxn}=  -37 kJ

To calculate the heats of reaction by using enthalpies of formation; we have:

\delta H^0_ {rxn}= ∑ \delta H^0_ {products} -  ∑ \delta H^0_ {reactants}

\delta H^0_ {rxn}= ∑ \delta H^0_ {CH_3CH_2OH} - ∑ \delta H^0_ {CH_2=CH_2+H_2O}

\delta H^0_ {rxn}=  (-235.1 kJ) - [(+52.47 kJ) + (-241.826 kJ)]

\delta H^0_ {rxn}=  -45.7 kJ

6 0
3 years ago
How do we turn petroleum into energy we use?
arlik [135]

You don't "turn" it into energy; petroleum HAS stored energy (chemical energy).However, you can turn it into ANOTHER TYPE OF ENERGY; usually this is done by burning the petroleum, and using it to drive machinery.

Since burning fuels is wasteful (the efficiency is limited, in theory, to the Carnot efficiency of a heat engine), other options are being explored, such as chemical reactions in a fuel cell. But such technology is not yet used on a large scale.

7 0
3 years ago
Which of the following elements has the most properties in common with iron (Fe)?
Fudgin [204]
If my memory serves me well, the following element which has the most properties in common with iron (Fe) is definitely <span>Osmium (Os) because they are stand for the same group! 
I'm sure it helps!</span>
8 0
3 years ago
Read 2 more answers
What is the pH of a substance that has a hydrogen ion concentration of<br> 8.8x10^(-5) M? *
stealth61 [152]

Answer:

The pH of the substance is 4,06.

Explanation:

The pH indicates the acidity or basicity of a substance. PH values between 0 and less than 7 indicate acidic solutions, 7 neutral and greater than 7 to 14 basic. It is calculated as:

pH = -log (H +)

pH= -log (8.8x10^-5)

<em>pH=4,06</em>

5 0
3 years ago
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